John Harris: “So there they are: three American presidents turning 80 this summer, old men by any measure. They have starkly different styles, temperaments and goals for their country. But they are united in some important ways. All in their own way and in their time were uncommonly talented politicians.”“All three are also the preeminent representatives of the generation that trashed American politics.”“Clinton, Bush and Trump surely hold significantly different measures of culpability for the squalor of American political culture. But all three children of 1946 are central characters in a decades-long descent in which Americans have been progressively more tribalistic in their political affiliations; ever-more coarse and insulting in public discourse; more mystified by and contemptuous of those who disagree; less trusting in government and most other establishment institutions, less confident in the country’s ability to reliably and rationally govern itself or fashion a consensus around solving long-term problems, or even to agree on the most basic standards of right and wrong.”